package thread;

import java.util.*;

/**
 *并发安全的集合API：
 * ArrayList、LinkList、HashSet都不是并发安全的(异步)
 */
public class SyncDemo4 {
    public static void main(String[] args) {
        //List<Integer> c =new ArrayList<>();
        //List<Integer> c =new LinkedList<>();
        //Set<Integer> c =new HashSet<>();
        List<Integer> c = Collections.synchronizedList(new ArrayList<>());
        //List<Integer> c =Collections.synchronizedList(new LinkedList<>());
        //Set<Integer> c=Collections.synchronizedSet(new HashSet<>());
        Thread t1 =new Thread(){
          public void run(){
              for (int i = 0; i <1000 ; i++) {
                  c.add(i);
              }
          }
        };
        Thread t2 =new Thread(){
            public void run(){
                for (int i = 1000; i <2000 ; i++) {
                    c.add(i);
                }
            }
        };
        t1.start();
        t2.start();

        try {
            Thread.sleep(50);
        } catch (InterruptedException e) {

        }
        System.out.println(c.size());
    }
}
